Method for inverting CCUS pressure and saturation changes based on 4D PP-PS waves in porous medium

A 4DPP-PS, pore medium technology, applied in the field of CCUS pressure and saturation variation based on 4D PP-PS wave inversion in pore media, can solve the problem of separating reservoir pore pressure and CO2 saturation, without systematic distinction. Reservoir pore pressure and CO2 saturation, etc.

Inactive Publication Date: 2019-11-12
NORTHWEST UNIV(CN)
View PDF7 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the field of CO2 geological storage, there are few studies based on 4D PP-PS wave data, and most of the studies are quantitative descriptions, without systematically distinguishing the i...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for inverting CCUS pressure and saturation changes based on 4D PP-PS waves in porous medium
  • Method for inverting CCUS pressure and saturation changes based on 4D PP-PS waves in porous medium
  • Method for inverting CCUS pressure and saturation changes based on 4D PP-PS waves in porous medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] A method for inverting pressure and saturation changes in CCUS based on 4D PP-PS waves in porous media, including the following steps:

[0024] First, starting from well logging curves, based on well logging curves and logging data interpretation results, the positions of reservoirs and cap rocks are divided, and starting from the logging curve data of reservoirs and cap rocks, reservoir and cap rocks are constructed. The two-layer model of the porous medium layer, the logging curves of the reservoir and the caprock are as follows figure 1 , Table 1 is the basic parameters of the two-layer media model.

[0025] figure 1 The log curves of well X in an oilfield after sorting, from left to right are the curves of P-wave velocity, shear-wave velocity, density, effective porosity, water saturation, shale content and total porosity. The cap rock is gypsum...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

Disclosed is a method for inverting CCUS pressure and saturation changes based on 4D PP-PS waves in a porous medium. The change rule of three-phase fluid (CO2, water, and oil) saturation of a reservoir under different injection quantities of CO2 or different stages of an injected stratum is constructed, and based on this, a fluid replacement model of different stages of CO2 injection is established. The change relationships of longitudinal wave velocity, transverse wave velocity and density change rate of the stratum alone with pore pressure and CO2 saturation before and after fluid replacement are acquired, fitting curves having the highest correlation coefficients are selected by multiple fittings to build a bridge between the elastic parameters of the stratum and the stratum pore pressure and CO2 saturation, the change relationship between the difference of four-dimensional PP-PS wave superposition data and the stratum pore pressure and CO2 saturation is constructed, and a variant is determined, which helps to determine the distribution range of CO2 injected into the ground and possible CO2 leakage points, and to better evaluate the safety of CO2 geological storage.

Description

Technical field: [0001] The present invention relates to CO 2 The field of 4D PP-PS wave joint inversion technology in oil flooding and geological storage, especially the method of inverting CCUS pressure and saturation changes based on 4D PP-PS wave in porous media, used to calculate CO 2 In geological storage, in CO 2 Changes in reservoir pore pressure and fluid saturation before and after injection and at different stages of injection underground. Background technique [0002] With the continuous implementation and promotion of CCUS projects such as Weyburn, the inversion of reservoir pore pressure and CO 2 Saturation has become a research hotspot. The current research is mainly based on time-shifted PP wave data, and there are few studies on four-dimensional PS wave data, especially in CO 2 - In the field of EOR and geological storage, by using PS wave data to monitor underground reservoir pressure, CO 2 Variations in saturation and fractures in subsurface reservoir...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01V1/30G01V1/28
CPCG01V1/282G01V1/306
Inventor 杨扬马劲风王喆李丹鹭王祥钟高润
Owner NORTHWEST UNIV(CN)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap